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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '44e9477a592185b72463e788598640370d260f63a40def96c01b5bf5aedb4a6f' 
  AND token = 'dpWE7kWSoVqhMiyy1aexE2UGP4YM2MYVkemLP3Xu5CQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}